Baby Watch

Michael Phelps took his wife and his fetus out on the town on Tuesday -- treating the gang to a OneRepublic show!

Earlier that day, Nicole Phelps announced she was preggo with baby #2 -- but it wasn't until she hit the concert that she decided to show off her baby bump.

The Phelps' got to hang backstage with the band before the Phoenix show -- and tweeted about it, "These guys were amazing to see live the other night!! So talented!!!"

He's right. Counting Stars is a good song.

Swimmers gonna swim.

Michael Phelps just announced his wife, Nicole, is pregnant with baby #2 -- a little over a year after she gave birth to their first kid.

"Number 2 on the way," the Olympic legend said ... "So excited! Wonder if it's a boy or a girl."

Michael and Nicole got married in a secret ceremony back in June, right after their 1st son Boomer was born.

Now, they're adding to their brood ... and once again, doing it faster than Ryan Lochte.

Congrats!

Serena Williams is getting hilariously loopy in her pregnancy ... like, laugh out loud funny.

With the baby due in roughly 2 weeks (or less) ... a very pregnant Serena used a Sharpie pen to draw on her stomach for a sports-style breakdown of how the birth is gonna go.

It's almost like if John Madden had to draw up and break down the delivery.

After that, Serena honed in on her baby daddy, Alexis Ohanian -- and pointed out the gray hairs on his beard.

Don't worry ... she's got a solution for how to make the gray go away -- and it's really funny!

Scott Stapp's proof even rock stars are softies ... just look at his awesome gender reveal.

The ex-Creed frontman was performing at the 13th annual Bat Fest in Austin where he decided it was the best place to reveal what his pregnant wife's poppin' next.

Check it out ... Scott brings her up, along with 2 of his kiddos. He asks his boy and girl for a prediction before the countdown starts. For the record, they both want a boy.

TMZ's not in the habit of giving away spoilers -- kiiiiiiidding -- so we'll just let ya find out for yourself.

April Love Geary is 3 months pregnant, but you wouldn't know it ... at all.

Robin Thicke hit up the pool with his 22-year-old gf on their babymoon on the North Shore of Hawaii.

The couple's been dating for 3 years, and announced they are expecting Thursday -- the due date's March 1, which would have been Alan Thicke's 70th birthday.

It will be kid #2 for Robin ... who just struck a custody deal with his ex, Paula Patton, for their 7-year-old son, Julian.

Big month for Derek Jeter -- first he gets the Marlins and now HIS FIRST KID!

Jeter's wife, Hannah Davis, gave birth to Bella Raine Jeter on Thursday, August 17, Jeter's media outlet The Player's Tribute confirmed.

The Yankees tweeted a message to Jeter ... saying, "Congrats to Derek & Hannah Jeter on the birth of their daughter, Bella Raine Jeter. We can't wait to meet her!"

Question is ... with Jeter expected to buy the Marlins, will the kid grow up rooting for Miami or New York!??!

Jeter and the Sports Illustrated Swimsuit Edition cover model started dating back in 2011. They got engaged in 2015 and finally tied the knot last year in Napa, California. She's 27. He's 43.

Bella is their first child.

Back when Jeter retired from baseball in 2014, he said he wanted to start a family. Mission accomplished.

Congrats!

Robin Thicke is about to be a father again, with a girlfriend who is barely able to legally drink.

22-year-old April Love Geary is 3 months pregnant with a girl ... the baby is due March 1.

40-year-old Robin has been dating April for 3 years ... shortly after his wife, Paula Patton, filed for divorce.

Robin and Paula are still not divorced, and they have had an on-and-off custody war over their 7-year-old son, Julian. By the way, we're told Robin and April told Julian this week and he's "super excited for a little sister."

March 1 would have been Alan Thicke's 70th birthday.

When you're eating for 2 ... ya gotta stock up!!

That's why Serena Williams hit the grocery store with fiance, Alexis Ohanian, and her mom Oracene Price this weekend ... and HAM in the aisles.

The gang rolled into Publix in Palm Beach Gardens (try the crab legs!) and filled their shopping cart to the brim in preparation for Serena's big day.

By our count, she's about 37 weeks pregnant (40 weeks is the target) -- but at this point, it could happen any minute.

Williams tweeted about how the pregnancy is affecting her body over the weekend -- "It's official. I no longer have ankles."

The man Donald Trump picked to be his communications director who mysteriously resigned before the inauguration has just had 2 babies ... but only one of them with his wife.

Jason Miller, the guy who was Trump's official mouthpiece during last year's presidential run, has fathered a baby with Trump loyalist/attorney/talking head A.J. Delgado.

Numerous reports surfaced after Miller resigned that he and Delgado had been having an affair for months, and the stories made news when Miller, Delgado and others partied at a Vegas strip club the night before one of the presidential debates.

Delgado didn't really keep it much of a secret after Miller's resignation, calling him, "the 2016 version of John Edwards."

Now get this ... Miller confirmed the birth of the child to Page Six, saying, "My wife and I, along with our two daughters, are excited to welcome William into the world and into our family, and we appreciate the well wishes we've received from so many" -- i.e., he says his wife is down with it!

For her part, in the last 12 hours A.J. has gone on a Twitter tirade railing on Miller, saying, "I'm not sure what Jason means that he and his wife are excited to welcome Will. Really? News to me. Let me shut up before I say more..."

But that was after A.J. went in on Page Six, claiming, "At least 5 wrong facts in your article. Really bizarre. And you never attempted to contact me by phone today. That's a lie."

Not to mention, before the article even broke she, without naming Miller as the father, tweeted, "The father did not/has not sent the child even a $1, or a single gift/item. I have had to pay for/cover everything myself. Cheers."

Congratulations?

Serena Williams dusted off the poodle skirt and saddle shoes to travel back to the Fabulous '50s for her baby shower over the weekend ... but not without the help of her superstar friends!!

Now we know Cristiano Ronaldo enjoys giving his smoking hot pregnant girlfriend some supporting love taps ... and she enjoys providing him with beautiful scenery.

The football star and his expecting gf, Georgina Rodriguez, cozied up on a luxury yacht in Ibiza last week ... clearly enjoying each other's company.

Being 35 weeks pregnant ain't gonna stop Serena Williams from gettin' her sweat on ... 'cause the tennis superstar is still killiin' it in the gym during her 3rd trimester!!

Williams -- who announced she was 20 weeks pregnant back in mid-April -- hasn't slowed down one bit with a bun in the oven ... playing preggo tennis and posing naked for the cover of Vanity Fair.

Serena told TMZ Sports in May that she's not gonna retire once she gives birth -- and her mom says she's gunning to return to the court as soon as possible.

G.O.A.T.

The baby business is BOOMIN' for Antonio Brown -- his girlfriend just gave birth to their brand new son!

The Pittsburgh Steelers wide receiver was able to get away from football Tuesday for the birth of Apollo Brown!

(It helps that today was a scheduled off day for Steelers players!)

Both baby and daddy looked great (Antonio had a big smile on his face) -- hopefully mom, Chelsie Kyriss, is doing well too.

It's AB's 5th kid -- 3 with Chelsie and 2 from a previous relationship.

George and Amal Clooney are ready to defend their infant twins in court ... as they vow to sue a French magazine that published pics of them.

The mag, "Voici," published shots on Friday of the Clooneys cradling Alexander and Ella. They appeared to be in a backyard, and George says that's exactly what happened ... and he's pissed.

In a statement he says, "Over the last week photographers from Voici magazine scaled our fence, climbed our tree and illegally took pictures of our infants inside our home. Make no mistake the photographers, the agency and the magazine will be prosecuted to the full extent of the law."

Assuming it went down as George said ... he's got a strong case. Under French law, public figures -- like George -- can only be photographed while going about their public lives ... and only for journalistic purposes.

Even in Italy -- where George and Amal were in the photos -- photogs cannot peep into a private residence or take photos of people or objects hidden from normal visibility.

George says, "The safety of our children demands" he go forward with a lawsuit.

The magazine responded saying the pictures published "are a response to a public demand" and that the pictures "do not put in danger Mr. Clooney, his wife or their kids."

Kevin Hart and his pregnant wife look to be rock solid ... on the sand down in Cabo San Lucas.

Eniko's about six months along right now and still rocking a bikini during their Mexican beach vacay. She and Kevin showed no signs of tension the week after cheating allegations were reported. Kevin's dismissed that as "BS" ... btw.

The Harts were hanging with Ludacris and his wife, along with several other friends -- and the guys were flexing and mugging around the pool.

Jessica Alba's got her third bun in the oven ... and she's making sure it gets plenty of sun.

Alba's currently enjoying summer in Hawaii on the heels of news she's having another kid. She's already mom to 2 daughters -- 9-year-old Honor and 5-year-old Haven -- with husband Cash Warren.